PZL Bielsko SZD-19
| PZL Bielsko SZD-19 | |
|---|---|
 SZD-19A "Zefir 2A" |
|
| Type: | High performance glider |
| Design country: | |
| Manufacturer: | |
| First flight: |
|
| Production time: |
1958-1963 |
| Number of pieces: |
23 |
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The PZL Bielsko SZD-19 Zefir is a single-seat high-performance glider from the Polish company Szybowcowy Zakład Doświadczalny ( German glider development plant ).
development
The project work began in 1957 under Bogumił Szuba and named SZD-19X Zefir 1 . Stanislaw Skrzydlewski completed the first flight of the prototype with the registration number SP-1841 on December 31, 1958. After extensive, unsatisfactory tests, the decision was made to completely redesign the aircraft. From 1959 the SZD-19-2 Zefir 2 was created , the prototype of which with the registration number SP-2067 was first flown by Skrzydlewski on March 11, 1960. The shoulder wing was largely made of wood and the shape of the hull was based on that of the SZD-24 . Head of development Szuba provided the Zefir 2 with hydraulically driven Fowler flaps , but did not equip it with airbrakes, which gave it good flight characteristics, but a problematic landing behavior, which the existing braking parachute could not compensate for. The Zefir 2 made its debut at the 1960 World Championships in Butzweilerhof , where the two aircraft built up to that point with Edward Makula and Jerzy Popiel took 2nd and 3rd place in the open class .
Then the type was revised by Roman Zatwardzicki. The Zefir received a larger horizontal stabilizer, and the mechanics of the retractable landing gear and the braking parachute were changed. The aircraft equipped in this way received the designation SZD-19A Zefir 2A and was built in the SZD Jeżów plant from 1962 in a small series of 20 pieces. The first production copy flew for the first time on January 24, 1962 with the registration number SP – 2370 . With this version, Makula and Popiel took 1st and 2nd place at the 1963 World Cup in Junín ( Argentina ). In addition, Makula set several Polish records with the Zefir 2A. He completed a 100 km triangular flight at 102.1 km / h and a 200 km flight at 93.9 km / h. From 1964 onwards, almost without exception, these aircraft received another modified braking parachute mechanism. This modification was named SZD-19-2B Zefir 2B .
A total of 23 copies of the Zefir were built between 1958 and 1963, of which up to 13 SZD-19-2s were exported to eight countries between 1960 and 1963. Specifically, these were Argentina , Belgium , Germany , France , Italy , Romania , the Soviet Union and the USA .
Further developments are the Zefir 3 (1965) and Zefir 4 (1967).
Technical specifications
| Parameter | Data (SZD-19X Zefir 1 ) | Data (SZD-19A Zefir-2A ) |
|---|---|---|
| Years of construction | 1958 | 1960-1963 |
| constructor | Bogumił Szuba | Roman Zatwardzicki |
| crew | 1 | |
| span | 17.00 m | |
| length | 7.3 m | 7.20 m |
| height | 1.27 m | 1.64 m |
| Wing area | 14.00 m² | |
| Wing extension | 20.64 | |
| Wing loading | 30.8 kg / m² | Max. 30.0 kg / m² |
| Preparation mass | 337 kg | 330 kg |
| Max. Takeoff mass | 432 kg | 415 kg |
| Glide ratio | 30 at 90 km / h | 34.5 at 95 km / h |
| slightest sinking | 0.83 m / s at 94 km / h | 0.72 m / s at 87 km / h |
| Largest load multiple | + 5.5 / −3.5 | |
| Top speed | 220 km / h | |
| Minimum speed | 61 km / h with flaps | 71 km / h 62 km / h with flaps |
| Rate of descent | 0.95 m / s at 100 km / h | 0.81 m / s at 100 km / h |
| profile | NACA 65-2-515 mod. | |
literature
- Kazimierz Wojciech Chudzinski: Polish gliders. Volume 1: 1945-1970. Verlag für Technik und Handwerk, Baden-Baden 2014, ISBN 978-3-88180-454-7 .
- SZD-19-2 "Zefir 2". In: Aerosport. N. 7/1964, p. 245.
- The history of the “Zefir” types. In: Aerosport. No. 4/1966, pp. 114-117.
Web links
Individual evidence
- ↑ FliegerRevue August 2009, p. 67, collection series SZD-19-2- Zefir 2